Synthesis of ligand-carrying polymeric nanoparticles for use in extraction and recovery of metal ions
Synthesis of ligand-carrying polymeric nanoparticles for use in extraction and recovery of metal ions
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DOI：
10.1016/j.colsurfa.2017.08.036
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发表时间：
2017-11-20
影响因子：
5.2
通讯作者：
Chew, Jia Wei
中科院分区：
文献类型：
--
作者：
Tan, Yong Zen;Wu, Dalin;Chew, Jia Wei
功能化纳米颗粒（NPs）是广泛应用的关键。np的更通用的用途取决于随时修改它们以执行不同功能的能力。例如，承载配体的功能化聚合物纳米材料可用于金属离子的提取和回收。然而，通过配体共聚获得离子印迹颗粒很难扩大规模。因此，我们提出了一种替代方法来获得用于金属离子吸收的携带配体的聚合物纳米颗粒（LC-NPs）。采用支化聚乙烯亚胺（b-PEI）对无表面活性剂乳液聚合得到的带负电荷的聚苯乙烯（PS） NPs进行了“冲浪者”改性。得到的PEI-PS NPs进一步与邻苯二醛交联，形成交联PEI-PS （CPEI-PS）。PEI-PS和CPEI-PS都能吸收铬、镍、钴和铜离子，吸收后颜色变化明显。此外，两种粒子的离子吸收能力相当，但对铜离子有更大的选择性。CPEI-PS对铜离子的选择性随双醛交联程度的增加而增加。与非交联的PEI-PS相比，重复的吸收-解吸循环对CPEI-PS的吸收能力没有损失。最后，两者都与两种不同的醛进一步反应，这确定了伯胺基团存在于与醛的进一步反应中，从而使这些颗粒进一步功能化。
Functionalized nanoparticles (NPs) are critical to a wide-ranging of applications. The more versatile use of the NPs hinges on the capability to readily modify them to perform different functions. For example functionalized polymeric nanomaterials bearing ligands can be employed in metal ion extraction and recovery. However, obtaining ion-imprinted particles via ligand copolymerization can be difficult to scale-up. We therefore present an alternative method to obtain ligand-carrying polymeric nanoparticles (LC-NPs) for metal ion absorption. Branched polyethyleneimine (b-PEI) was used to modify the negatively charged surfactant-free polystyrene (PS) NPs obtained via surfactant-free emulsion polymerization by employing "surfmers". The obtained PEI-PS NPs were further cross-linked with phthaldialdehyde to form cross-linked PEI-PS (CPEI-PS). Both PEI-PS and CPEI-PS were capable of absorbing chromium, nickel, cobalt and copper ions, as evident in the color change upon absorption. Furthermore, the ion absorption capacity of both types of particles was comparable, but with a greater selectivity toward copper ions. The selectivity towards copper ions of CPEI-PS increased with the degree of dialdehyde cross-linking. Repeated absorption-desorption cycles showed no loss in the absorption capacity of CPEI-PS as compared to the non-crosslinked PEI-PS. Finally, both were further reacted with two different aldehydes, which ascertained that the primary amine groups were present for further reaction with aldehydes and thereby enabling further functionalization of these particles.